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PDF RM3253 Data sheet ( Hoja de datos )
| Número de pieza | RM3253 | |
| Descripción | Off Line AC/DC Switcher IC | |
| Fabricantes | REACTOR | |
| Logotipo |  |
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RM3253
RM3253
Off Line AC/DC Switcher IC
Description
The RM3253 series switcher ICs cost effectively replace all power supplies up to 5W output power based on
unregulated isolated linear transformer (50/60HZ). Unlike conventional PWM (pulse width modulation)
controllers, they regulate the output voltage in a new method of off-time modulation control. The controller
consists of a VCO (voltage control oscillator), Sense and logic circuit, VDD pin, under-voltage lockout circuit,
protection for over-voltage, current limited circuit, leading edge blanking, over load protection and fault condition
auto-restart. They are ideal low power AC/DC adapter/charger solution for portable devices,
Features
• Built-in 800V high voltage BJT and minimal external componets
• Low start-up current: Typ.15 μA Max.25 μA
• UVLO(under voltage lockout):Typ.12V start-up Typ.6V shut-down
• Low operating current:Typ.2 mA Max.5 mA
• LEB(leading edge blanking): Typ.300ns
• OVP(over voltage protection): Typ.28 V
• Operation Frequency: Typ.54KHZ(VDD=21V)
• Output Driver Ability: Typ.15 mA
• OLP(over load protection)
• Universal AC input range
• Constant voltage and constant current
• SOP-8 package.
Applications
•AC/DC adapter/charger for cell/cordless phones, digital cameras, MP3/portable audio devices etc
• LED Lighting
• Replacements for linear transformers and RCC SMTPS
Package
1
1 page  
Electrical Characteristic
Item
Supply Voltage
Start-up Current
Operation Voltage
Turn-on Threshold Voltage
Turn-off Threshold Voltage
Over-voltage Thershold
Oscillator
Operation Frequency
Duty Cycle
Green Mode Frequency
Current Sensing
Leading Edge Blanking
Current Sense Detection Voltage
Else
Output Delay Time
Output Driver Current
Conditions
VDD=VDD(ON)-0.1
25℃
VDD ON
VDD OFF
Vovp
25℃
Vsense=0
25℃
25℃
VDD=15V
25℃
25℃
Absolute Maximum Ratings
RM3253
MIN. TYP. MAX. Unit
15 25
21
11 12 13
5.5 6 6.5
28 30
uA
V
V
V
V
45 50 55 KHZ
75 %
15 20 25 KHZ
250 300 350
0.45 0.5 0.55
nS
V
150
12 15 18
nS
mA
Attention: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet RM3253.PDF ] | |
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